Fix client certificate/key support for Network v2 commands

Currently network v2 commands don't support client certificate/key
because they were not passed to OpenStackSDK Connection which is used
by network v2 commands.

This changes corrects the integration with OpenStacKSDK to pass client
certificate/key.

Closes-Bug: #1569513
Related-Bug: #1569508
Depends-On: Ic093f8515e7b15931994e4516ebec8f4399d021e
Change-Id: Ie37e8e988ca695a09894c6c93560dacd83f17030

Author: ZZelle

openstackclient/network/client.py

@@ -36,7 +36,9 @@ def make_client(instance):
     prof.set_region(API_NAME, instance._region_name)
     prof.set_version(API_NAME, instance._api_version[API_NAME])
     conn = connection.Connection(authenticator=instance.session.auth,
-                                 verify=instance.session.verify, profile=prof)
+                                 verify=instance.session.verify,
+                                 cert=instance.session.cert,
+                                 profile=prof)
     LOG.debug('Connection: %s', conn)
     LOG.debug('Network client initialized using OpenStack SDK: %s',
               conn.network)